fear vs apprehend

fear is a noun but apprehend is not a noun.

Word	Noun	Adjective	Verb	Adverb
fear	Yes	No	Yes	No
apprehend	No	No	Yes	No

fear (noun)	apprehend (noun)
an emotion experienced in anticipation of some specific pain or danger (usually accompanied by a desire to flee or fight)
an anxious feeling
a feeling of profound respect for someone or something

fear (verb)	apprehend (verb)
be afraid or scared of; be frightened of	get the meaning of something
regard with feelings of respect and reverence; consider hallowed or exalted or be in awe of	take into custody
be sorry; used to introduce an unpleasant statement	anticipate with dread or anxiety
be afraid or feel anxious or apprehensive about a possible or probable situation or event
be uneasy or apprehensive about